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: Breast cancer is the most common type of cancer globally and its treatment with many FDA-approved synthetic drugs manifests various side effects. Alternatively, phytochemicals are natural reserves of novel drugs for cancer therapy. Punica granatum commonly known as pomegranate is a rich source of phytopharmaceuticals. Methods : The phytoconstituents of Punica granatum leaves were profiled using GC-MS/MS in the present work. Cytoscape-assisted network pharmacology of principal and prognostic biomarkers, which are immunohistochemically tested in breast cancer tissue, was carried out for the identification of protein target. Followed by, rigorous virtual screening of 145 phytoconstituents against the three ER isoforms (α, β and γ) was performed using Discovery Studio. The docked complexes were further evaluated for their flexibility and stability using GROMACS2016 through 50 ns long molecular dynamic simulations. Results : In the current study, we report the precise and systematic GC-MS/MS profiling of phytoconstituents (19 novel metabolites out of 145) of hydromethanolic extract of Punica granatum L. (pomegranate) leaves. These phytocompounds are various types of fatty acids, terpenes, heterocyclic compounds and flavonoids. 4-coumaric acid methyl ester was identified as the best inhibitor of ER isoforms with drug-likeness and no toxicity from ADMET screening. γ-ligand binding domain complex showed the best interactions with minimum RMSD, constant Rg, and the maximum number of hydrogen bonds. Conclusion : We conclude that 4-coumaric acid methyl ester exhibits favourable drug-like properties comparable to tamoxifen, an FDA-approved breast cancer drug and can be tested further in preclinical studies.

frontiers in bioscience

Gas chromatography-mass spectrometry metabolic profiling, molecular simulation and dynamics of diverse phytochemicals of Punica granatum L. leaves against estrogen receptor